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Aj Bell Data Scientist Interview Questions

The questions to prepare for a Aj Bell Data Scientist interview. Questions from real interview reports rank first. Updated daily.

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1
Machine LearningStart here. 3 questions · ~24 min
Bias-Variance for Churn ModelsMedium

Tests understanding of model generalization and practical techniques to balance bias and variance.

Cross-ValidationBias-Variance TradeoffRegularizationAj Bell
Diagnose Post-Deployment Model DriftHard

Tests monitoring, root-cause analysis, and remediation for deployed machine learning systems.

Cross-ValidationFeature EngineeringBias-Variance TradeoffAj Bell
Choose and Justify Modeling ApproachMedium

Tests model selection reasoning, tradeoff awareness, and justification of approach for business outcomes.

Cross-ValidationFeature EngineeringSupervised LearningAj Bell
2
More topics2 questions · ~16 min
SQL for Active Traders Last 30 DaysMedium

Tests SQL skills for event filtering, deduplication, and correct handling of canceled transactions.

Date FunctionsJoinsAggregationsAj Bell
Strengths and WeaknessesMedium

Assesses self-awareness, reflection, and how you identify areas to improve.

strengthsweaknessesAj Bell

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Hands-on SQL practiceWrite and run real queries in the editor. 3 drills · ~30 min
Find Duplicate Records in SQLEasy
Practice
Practice drill

Use GROUP BY and HAVING to find duplicate patient records in a Johns Hopkins Medicine dataset.

Data WranglingGroup ByHavingEmersonCareDxSberbank
Top Product Revenue Last 30 DaysMedium
Practice
Practice drill

Use joins, a CTE, and aggregation to rank the top 5 products by non-returned revenue in the last 30 days.

Date FunctionsJoinsAggregationsBlue NileO'Reilly Auto PartsCengage
Top Customers by Last-Quarter SpendMedium
Practice
Practice drill

Join customers and transactions, filter to the previous quarter, aggregate spend, and return the top three customers by total spend.

Date FunctionsJoinsAggregationsApptioQuantiphiDiscover
The finish line: interview-readyComplete all 5 questions plus 3 hands-on drills to finish this plan.